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Old 03-31-2015, 04:44 PM
 
Location: Tennessee/Michigan
27,994 posts, read 46,359,104 times
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In case of an emergency, you donít want to have any doubt that your necessary battery-powered devices are ready to work the moment you need them. But most of us donít have a meter to help us test our AA and AAA batteries, which means that it can be hard to verify that theyíll be reliable when it counts. Luckily, thereís an easy way to tell if your batteries are good to goÖ and you donít need any kind of special equipment.

His Simple Trick Tells If Your Batteries Are Dead, And It’s SO BRILLIANT! - LittleThings.com
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Old 04-01-2015, 10:39 PM
 
37,071 posts, read 38,273,370 times
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That's cool. I'm already envisioning the bar trick to make me money. LOL
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Old 04-02-2015, 03:40 PM
 
33,134 posts, read 39,078,504 times
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I'll be damned,it works as claimed
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Old 04-03-2015, 06:24 AM
 
Location: Victoria TX
42,668 posts, read 71,538,289 times
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He cals that a "reliable" test? Does it matter what kind of surface you drop them on? Does it matter if you do not have a known good battery, to compare the suspect battery with?

Would you throw away every battery in your house that bounces and tips over, without any further testing? If your flashlight has a weak battery and a dim light, but the battery passes this test, would you keep on using it?

What a lot of baloney.
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Old 04-03-2015, 09:00 AM
 
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Quote:
Originally Posted by jtur88 View Post
He cals that a "reliable" test? Does it matter what kind of surface you drop them on?
I would suspect it doesn't matter. I would also suspect what is happening is you have a material inside that is acting as shock absorber. As it loses it charge it must expand and lose it's shock absorbing ability.

We've all seen batteries that have oozed material, perhaps that process is accelerated inside the battery as it loses it charge.


Quote:
Would you throw away every battery in your house that bounces and tips over, without any further testing? If your flashlight has a weak battery and a dim light, but the battery passes this test, would you keep on using it?
I think this is one of those interesting little tips you may or may not use. Suppose you put a battery in flashlight that should be good and it doesn't work, you can do a quick check to see if it might be the battery before looking at the flashlight.
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Old 04-03-2015, 12:43 PM
 
Location: Victoria TX
42,668 posts, read 71,538,289 times
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Quote:
Originally Posted by thecoalman View Post
I would suspect it doesn't matter.
Yes it would. You would get different bounce characteristics dropping on a formica countertop, a marble surface, a particle-board table, or your car's dashboard. How would you know how a fresh battery would bounce on such a surface, to compare your test battery?
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Old 04-03-2015, 03:03 PM
 
37,071 posts, read 38,273,370 times
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Quote:
Originally Posted by jtur88 View Post
Yes it would.
Certainly if you dropped it on a rubber mat it might make a difference but any solid hard surface should have about the same results. The difference in the compressions of the formica, wood etc with such a small amount of weight is going to be negligible. Perhaps some soft white pine with no poly on it might make a noticeable difference...
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Old 04-03-2015, 03:59 PM
 
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I checked two batteries with a tester,one was dead the other brand new, i dropped them on a wooden coffee table, the dead one bounced the new one didnt .
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Old 04-03-2015, 05:30 PM
 
Location: (six-cent-dix-sept)
3,964 posts, read 1,936,696 times
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i like this one better (but i dont think drop test would work on it):

https://www.youtube.com/watch?v=xjUzF4TrEAQ
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Old 04-03-2015, 10:54 PM
 
Location: Heart of Dixie
12,448 posts, read 10,130,341 times
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I'm definitely skeptical about these "tips," so I got my box of forty unused batteries of various brands and sizes then dropped each one on a granite counter top.

Six of my unused batteries bounced (2 AAAs, 3 AAs, and 1 C), and the rest hit the counter with a thud. When I got my meter to test the batteries I was surprised to find the six that bounced were at 0.22 - 0.63 volts, and the rest are at 1.55 - 1.65 volts.

It's caused by the gel in the alkaline battery becoming more dense as the battery is depleted.
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